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Showing 1 to 20 of 59 for “"xylan"”.
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Thermoplastic xylan derivatives and related blends
… substituent chemistry and melt behavior for xylan derivatives was investigated by differential scanning calorimetry and parallel-plate dynamic viscometric measurements. Xylan esters exhibit characteristic Tg values which decrease with increasing size of substituent. However, these materials …
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Xylan degradation in filamentous fungi and bacteria
Embargo set by: Seth Robbins for item 98742 Lift date: 2019-03-01T17:05:02Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system
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Degradation of xylan by rumen Prevotella SPP
Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-15T10:00:36Z Item was in collections: University of Illinois Dissertations and Theses (ID: 204) Dissertations - Microbiology (ID: 748) No. of bitstreams: 4 Dodd.Dissertation.Final.pdf: 11501575 bytes, checksum: …
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Glucuronic Acid Patterning on Xylan in Arabidopsis thaliana
… properties to the cell wall. The hemicellulose xylan is the second-most abundant secondary cell wall polysaccharide after cellulose. For angiosperms, the xylan backbone consists of repeating xylosyl residues and is decorated along its length by acetate and glucuronic acid (GlcA). It is likely …
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Xylan chain length and plant cell wall assembly
… plant cell wall assembly and the synthesis of xylan, a hemicellulose, with a focus on its chain length. Xylan is a polysaccharide of β-1,4 linked xylosyl residues, some with short branches of acetyls or glucuronic acid. Xylan coats cellulose, but is this coating important for the cell wall …
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Pure culture and metagenomic approaches to investigate cellulose and xylan degradation
… of lignocellulose. The study of cellulases and xylanases that degrade cellulose and xylan into constituent monosaccharides is required to advance industrial application of these enzymes. The use of a traditional pure culture approach to discover and characterize cellulases and xylanases from …
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Biosynthesis and function of glucuronic acid substitution patterns on softwood xylan
… composed of cellulose, galactoglucomannan, xylan and lignin. This thesis focuses on the biosynthesis and function of Glucuronic acid (GlcA) decorations on softwood xylan. Results demonstrate that this GUX (GlucUronic acid substitution of Xylan)-dependent xylan branching is critical for the …
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Rapid pyrolysis of sweet gum xylan with applications in modelling wood
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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Isolation, expression, purification and characterisation of a novel acetyl xylan esterase from streptomyces species ORS10
… library was constructed and a putative acetylxylan esterase (AXEase) gene, axe10, was identified. The enzyme, Axe10, has moderate similarity to α/β hydrolase proteins, and contains an esterase/lipase superfamily conserved domain and a typical AXEase catalytic triad. The axe10 gene …
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Studies of Interactions Between Rod-like Celulose Nanocrystals and Xylan and Pullulan Derivatives: A Light Scattering Study
… adsorption of 2-hydroxypropyltrimethylammonium xylans (HPMAXs) of degree of molar substitution MS = 0.34 onto rod-like cellulose nanocrystals (DOE-2-12Bs) were probed with zeta-potential measurements and polarized and depolarized dynamic light scattering. Zeta-potential changes of HPMAX/water, …
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Glucuronoxylan Acetylation Patterns and Site-specific Acetyltransferases
… and biofuels, among others. Cellulose and xylan are the two major components of plant biomass, and their intermolecular interactions in the cell wall are crucial for plant growth and industrial use. In eudicots, these interactions are determined by the arrangement of the main substitutions …
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Molecular interactions of plant cell wall polymers
… main polymers in lignocellulose are cellulose, xylan, galactoglucomannan and lignin. Lignocellulose forms the majority of biomass on the planet and its utilization for construction, energy production, materials and pharmaceuticals may be important for a more sustainable future. For each of these …
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Biopolymer Structure Analysis and Saccharification of Glycerol Thermal Processed Biomass
… pretreatment, 41% of the lignin and 68% of the xylan is recovered in a dry powdered form by subsequent extractions without additional catalysts, leaving a relatively pure cellulose fraction, 84% glucan, as found in chemical pulps. Lignin structural analysis indicated GTP processing resulted in …
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Two thermostable hemicellulases and their effects on wood pulps
… of radiata pine kraft pulp were examined. The xylanase (two preparations) and mannanase had broad pH optima (6-7.5). The xylanases had temperature optima of 70°C (10 min assay) and the mannanase had an optimum of 80°C (10 min assay). All the cloned enzymes were thermostable with more than 95% …
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Plant cell wall degrading enzymes and their potential application to biofuel production
… degrade cellulose and the hemicellulosic polymer xylan, genes with various putative functions from both organisms were identified, cloned and expressed the recombinant proteins in Escherichia coli. A hemicellulase gene cluster from T. bryantii encoding genes predicted to have endoxylanase …
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The effect of different sources of dietary fiber on the plasma total and lipoprotein cholesterol, liver cholesterol, fecal neutral steroid excretion and histology of major organ tissues in hamsters
… 4 wk: control, oat bran, guar gum, cellulose, xylan and sacrifice. After 4 wk of the fiber diets (10% dietary fiber), the plasma TC levels were significantly lowered in the oat bran, guar gum and xylan groups (16%, 12% and 15%, respectively) (p<.05). They were also significantly lower than the …
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Compositional analysis and classification of Miscanthus using Fourier transform near infrared spectroscopy
… (mean ± S.D.) in glucan (40.4 ± 2.70%), xylan (20.7 ± 1.50%), arabinan (1.90 ± 0.40%), acetyl (2.84 ± 0.28%), lignin (20.5 ± 1.40%), ash (2.60 ± 1.80%), and extractives (5.60 ± 0.86%) - contents were observed for samples that were collected from Miscanthus bales stored indoors, under …
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Switchable butadiene sulfone pretreatment of lignocellulosic biomass
… presence of water. The sulfurous acid hydrolyzed xylan (hemicellulose), removing up to 91% of xylan into the liquid phase as a potential source of value-added products. In the pretreated solids, 90-99% of glucan was preserved, the key substrate for enzymatic hydrolysis of glucan to glucose and …
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Cloned xylanolytic and cellulolytic enzymes from an extreme thermophile
… was a successful purification step for five xylanolytic and cellulolytic enzymes cloned from the extreme thermophile ‘Caldocellum saccharolyticum’ strain Tp8T6.3.3.1. Temperature and length of heat treatment can be altered to give high recovery, or a high degree of purification. Higher …
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Structural colour from a helicoidal cellulose architecture in the secondary cell wall: Optical properties, cell wall composition, structure and morphology of components, and their assembly and interactions.
… structure of its main components, cellulose and xylan. The composition of the endocarp was characterised as 9 \% extractives, 36 \% cellulose, 23 \% xylan, and 30 \% lignin. The cellulose microfibrils were isolated in a long series of chemical purifications, and found to be extremely short - …
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